// HTMLParser Library $Name: v1_6 $ - A java-based parser for HTML
// http://sourceforge.org/projects/htmlparser
// Copyright (C) 2004 Joshua Kerievsky
//
// Revision Control Information
//
// $Source: /cvsroot/htmlparser/htmlparser/src/org/htmlparser/visitors/UrlModifyingVisitor.java,v $
// $Author: derrickoswald $
// $Date: 2004/07/31 16:42:35 $
// $Revision: 1.46 $
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//

package org.htmlparser.visitors;

import org.htmlparser.Node;
import org.htmlparser.Remark;
import org.htmlparser.Tag;
import org.htmlparser.Text;
import org.htmlparser.tags.CompositeTag;
import org.htmlparser.tags.ImageTag;
import org.htmlparser.tags.LinkTag;

public class UrlModifyingVisitor extends NodeVisitor
{
	private String linkPrefix;
	private StringBuffer modifiedResult;

	public UrlModifyingVisitor(String linkPrefix)
	{
		super(true, true);
		this.linkPrefix = linkPrefix;
		modifiedResult = new StringBuffer();
	}

	public void visitRemarkNode(Remark remarkNode)
	{
		modifiedResult.append(remarkNode.toHtml());
	}

	public void visitStringNode(Text stringNode)
	{
		modifiedResult.append(stringNode.toHtml());
	}

	public void visitTag(Tag tag)
	{
		if (tag instanceof LinkTag)
			((LinkTag) tag).setLink(linkPrefix + ((LinkTag) tag).getLink());
		else if (tag instanceof ImageTag)
			((ImageTag) tag).setImageURL(linkPrefix + ((ImageTag) tag).getImageURL());
		// process only those nodes that won't be processed by an end tag,
		// nodes without parents or parents without an end tag, since
		// the complete processing of all children should happen before
		// we turn this node back into html text
		if (null == tag.getParent()
				&& (!(tag instanceof CompositeTag) || null == ((CompositeTag) tag).getEndTag()))
			modifiedResult.append(tag.toHtml());
	}

	public void visitEndTag(Tag tag)
	{
		Node parent;

		parent = tag.getParent();
		// process only those nodes not processed by a parent
		if (null == parent)
			// an orphan end tag
			modifiedResult.append(tag.toHtml());
		else if (null == parent.getParent())
		// a top level tag with no parents
			modifiedResult.append(parent.toHtml());
	}

	public String getModifiedResult()
	{
		return modifiedResult.toString();
	}
}
